Book

• Minds, Ideas, and Objects: Essays on the Theory of Representation in Modern Philosophy. Co-edited with Guenter Zoeller. North American Kant Society Studies in Philosophy, Vol.2 Ridgeview Press, Atascadero, California, 1993. 

Papers

• "Perceptual Relativity and Ideas in the Mind," Philosophy and Phenomenological Research, 24 1963-64, 202-214.
• "Berkeley's Likeness Principle," Journal of the History of Philosophy, 4 1966, 63-69.
• "Kant on Outer and Inner Intuition," Nous, 2 1968, 271-292.
• "Hume's Disavowal of the Treatise," The Philosophical Review, 82 1973, 371-379.
• "Reid's Realism,"
• Journal of the History of Philosophy, 12 1974, 317-340.
• "Berkeley's Ideas of Sense," Nous, 9 1974, 55-72.
• "Reid on Abstract General Ideas," in Thomas Reid: Critical Interpretations, Barker and Beauchamp, editors, Philosophical Monographs, 1976, 62-76.
• "Hylas' Parity Arguments," Berkeley: Critical and Interpretive Essays, Colin Turbayne, editor, University of Minnesota Press, 1982, 283-294.
• "How Hume Read Berkeley: Hume's Account of Belief in an External World as a Variation on and Refutation of Berkeleian Immaterialism," Proceedings of the Heraclitean Society, Western Michigan University, 10 1985, pp.85-107.
• "On the status of visuals in Berkeley's new theory of vision," in Essays on the Philosophy of George Berkeley, E. Sosa, editor, by D. Reidel Publishing Company, 1987, pp.165-194.
• "Berkeley's Unstable Ontology," The Modern Schoolman, 67 (November-1989), 15-32.
• "Bayle, Leibniz, Hume and Reid on Extension, Composites, and Simples," History of Philosophy Quarterly, 7 (1990), 299-315.
• "Berkeley's Manifest Qualities Thesis", Journal of the History of Philosophy, 28 (1990), pp.385-401. Berkeley Prize Essay. Reprinted in Berkeley's Metaphysics, Structural, Interpretive, and Critical Essays, edited by Robert G. Muehlmann, Pennsylvania State University Press, University Park, PA., 1995, pp.107-125.
• "Hume on the Idea of Existence," Hume Studies, 17 1991, 61-82. Reprinted in David Hume: Critical Assessments, edited by Stanley Tweyman, Routledge, New York, 1995, vol. 3 (forthcoming).
• "Hume as Dualist and Anti-Dualist," Hume Studies, 21 1995, 47-55 
• "Hume on Qualities," Hume Studies, 22 1996 49-88. 
• "Hume on Possible Objects and Impossible Ideas," in Logic and the Workings of the Mind: The Logic of Ideas and Faculty Psychology in Early Modern Philosophy. Volume 5 of the North American Kant Society Studies in Philosophy. Edited by Patricia A. Easton. Ridgeview Press, Atascadero, California, 1997.